1 #!/usr/bin/ksh -p
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License (the "License").
   7 # You may not use this file except in compliance with the License.
   8 #
   9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10 # or http://www.opensolaris.org/os/licensing.
  11 # See the License for the specific language governing permissions
  12 # and limitations under the License.
  13 #
  14 # When distributing Covered Code, include this CDDL HEADER in each
  15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 # If applicable, add the following below this CDDL HEADER, with the
  17 # fields enclosed by brackets "[]" replaced with your own identifying
  18 # information: Portions Copyright [yyyy] [name of copyright owner]
  19 #
  20 # CDDL HEADER END
  21 #
  22 
  23 #
  24 # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  25 # Use is subject to license terms.
  26 #
  27 # ident "%Z%%M% %I%     %E% SMI"
  28 #
  29 
  30 # which_scm outputs two strings: one identifying the SCM in use, and
  31 # the second giving the root directory for the SCM, if known, or just
  32 # the current working directory if not known.
  33 
  34 # There are three distinct types of SCM systems we can detect.  The first
  35 # type have a control directory per directory (RCS and SCCS), with no other
  36 # structure.  The second type have a control directory in each subdirectory
  37 # within a tree (CVS and SVN).  The last type have a single control
  38 # directory at the top of the tree (Teamware and Mercurial).
  39 
  40 # If the common CODEMGR_WS variable is set, then we look there for the
  41 # SCM type and bail out if we can't determine it.
  42 
  43 # If that variable is not set, then we start in the current directory
  44 # and work our way upwards until we find the top of the tree or we
  45 # encounter an error.
  46 
  47 # We do handle nested SCM types, and report the innermost one, but if
  48 # you nest one of the "second type" systems within another instance of
  49 # itself, we'll keep going upwards and report the top of the nested
  50 # set of trees.
  51 
  52 
  53 # Check for well-known tree-type source code management (SCM) systems.
  54 function primary_type
  55 {
  56         typeset scmid
  57 
  58         [ -d "$1/Codemgr_wsdata" ] && scmid="$scmid teamware"
  59         [ -d "$1/.hg" ] && scmid="$scmid mercurial"
  60         [ -d "$1/CVS" ] && scmid="$scmid cvs"
  61         [ -d "$1/.svn" ] && scmid="$scmid subversion"
  62         echo $scmid
  63 }
  64 
  65 if [[ -n "$CODEMGR_WS" ]]; then
  66         if [[ ! -d "$CODEMGR_WS" ]]; then
  67                 print -u2 "which_scm: $CODEMGR_WS is not a directory."
  68                 exit 1
  69         fi
  70         set -- $(primary_type "$CODEMGR_WS")
  71         if [[ $# != 1 ]]; then
  72                 set -- unknown
  73         fi
  74         echo "$1 $CODEMGR_WS"
  75         exit 0
  76 fi
  77 
  78 ORIG_CWD=$(pwd)
  79 
  80 if [[ -d RCS ]]; then
  81         echo "rcs $ORIG_CWD"
  82         exit 0
  83 fi
  84 
  85 # If it's not Teamware, it could just be local SCCS.
  86 LOCAL_TYPE=
  87 [[ -d SCCS ]] && LOCAL_TYPE="sccs"
  88 
  89 # Scan upwards looking for top of tree.
  90 DIR=$ORIG_CWD
  91 CWD_TYPE=$(primary_type "$DIR")
  92 SCM_TYPE=
  93 while [[ "$DIR" != / ]]; do
  94         set -- $(primary_type "$DIR")
  95         if [[ $# > 1 ]]; then
  96                 echo "unknown $ORIG_CWD"
  97                 exit 0
  98         fi
  99         SCM_TYPE="$1"
 100         # We're done searching if we hit either a change in type or the top
 101         # of a "third type" control system.
 102         if [[ "$SCM_TYPE" != "$CWD_TYPE" || "$SCM_TYPE" == mercurial || \
 103             "$SCM_TYPE" == teamware ]]; then
 104                 break
 105         fi
 106         PREVDIR="$DIR"
 107         DIR=$(dirname "$DIR")
 108 done
 109 
 110 # We assume here that the system root directory isn't the root of the SCM.
 111 
 112 # Check for the "second type" of repository.  In all cases, we started
 113 # out in the tree and stepped out on the last iteration, so we want
 114 # $PREVDIR.
 115 if [[ "$CWD_TYPE" == cvs || "$CWD_TYPE" == subversion ]]; then
 116         echo "$CWD_TYPE $PREVDIR"
 117         exit 0
 118 fi
 119 
 120 # If we still don't know what it is, then check for a local type in the
 121 # original directory.  If none, then we don't know what it is.
 122 if [[ -z "$SCM_TYPE" ]]; then
 123         if [[ -z "$LOCAL_TYPE" ]]; then
 124                 SCM_TYPE=unknown
 125         else
 126                 SCM_TYPE=$LOCAL_TYPE
 127                 DIR=$ORIG_CWD
 128         fi
 129 fi
 130 
 131 echo "$SCM_TYPE $DIR"
 132 exit 0